Natroapophyllite Mineral Data

Natroapophyllite Mineral Data

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General Natroapophyllite Information

Chemical Formula:

NaCa4Si8O20F·8(H2O)

Composition:

Molecular Weight = 891.09 gm

Sodium 2.58 % Na 3.48 % Na₂O

Calcium 17.99 % Ca 25.17 % CaO

Silicon 25.21 % Si 53.94 % SiO₂

Hydrogen 1.81 % H 16.17 % H₂O

Oxygen 50.27 % O

Fluorine 2.13 % F 2.13 % F

- % F -0.90 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₄Si₈O₂₀F·8(H₂O)

IMA Status:

Approved IMA 1981

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek apophylliso - "it flakes off" and the composition.

Synonym:

Apophyllite

ICSD 100724

PDF 34-138

Natroapophyllite Image

Images:

Natroapophyllite

Comments: Pale pink opaque blocky crystal natroapophyllite aggregate.
Location: Boghil Quarry, Glengormley, Newtownabbey, County Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroapophyllite Crystallography

Axial Ratios:

a:b:c =0.9993:1:1.7779

Cell Dimensions:

a = 8.875, b = 8.881, c = 15.79, Z = 2; V = 1,244.55 Den(Calc)= 2.38

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.96(1), 2.98(0.63), 7.83(0.2),

Crystal Structure:

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Miura Y , Kato T , Rucklidge J C , Matsueda H , American Mineralogist , 66 (1981) p.410-423, Natroapophyllite, a new orthorhombic sodium analog of apophyllite, II. Crystal structure

Physical Properties of Natroapophyllite

Cleavage:

[001] Perfect

Color:

White, Pink, Green, Yellow, Violet.

Density:

2.3 - 2.4, Average = 2.34

Diaphaniety:

Transparent to Translucent

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Natroapophyllite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2266,KPDmeas= 0.2295,KC= 0.2277

Optical Data:

Biaxial (+), a=1.536, b=1.538, g=1.544, bire=0.0080, 2V(Calc)=62, 2V(Meas)=32.

Calculated Properties of Natroapophyllite

Electron Density:

r_electron=2.41 gm/cc
note: r_{Natroapophyllite}=2.38 gm/cc.

Fermion Index

Fermion Index = 0.01226
Boson Index = 0.98774

Photoelectric:

PE_{Natroapophyllite}= 3.23 barns/electron
U=PE_{Natroapophyllite} x r_electron= 7.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natroapophyllite is Not Radioactive

Natroapophyllite Classification

Dana Class:

72.3.1.3 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.3)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.3.1)Apophyllite group (4- & 8-membered rings)

72.3.1.0 Apophyllite* KCa4(Si4O10)2F·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.1 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.2 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.3 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

72.3.1.4 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m

Strunz Class:

VIII/H.01-10 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.01 - Apophyllite series

VIII/H.01-10 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

VIII/H.01-20 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

VIII/H.01-30 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

Other Natroapophyllite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Natroapophyllite

NaCa4Si8O20F·8(H2O)
Dana No: 72.3.1.3 Strunz No: VIII/H.01-10
Locality:

Notes: